{"cve":"CVE-2026-69244","nvd":{"published":"2026-08-03T21:16:42.273","modified":"2026-10-23T21:10:00.157","status":"Undergoing Analysis","description":"AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.3, an out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response. An attacker controlled server, or possibly an accidental response, could trigger a DoS in the client. The vulnerable path was error message construction in aiohttp/_http_parser.pyx, where an llhttp error-position pointer was used to build a snippet for malformed chunked responses and malformed request or response bytes at the buffer end. This issue is fixed in version 3.14.3.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":7.1},"cvss_v3":null,"cwes":["CWE-125","CWE-400","CWE-416"],"references":["https://github.com/aio-libs/aiohttp/commit/49f65d54150397892f7bcc4aae887767d51c322d","https://github.com/aio-libs/aiohttp/pull/13223","https://github.com/aio-libs/aiohttp/releases/tag/v3.14.3","https://github.com/aio-libs/aiohttp/security/advisories/GHSA-cq5v-8q36-5273"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:34.184483516+00:00"},"epss":{"cve":"CVE-2026-69244","score":0.00528,"percentile":0.444,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-cq5v-8q36-5273","url":"https://osv.dev/vulnerability/GHSA-cq5v-8q36-5273","summary":"AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)","modified":"2026-09-10T03:51:13.983479281Z","packages":[{"ecosystem":"PyPI","name":"aiohttp","purl":"pkg:pypi/aiohttp","ranges":["<3.14.3"],"fixed":["3.14.3"]}]},{"id":"PYSEC-2026-3545","url":"https://osv.dev/vulnerability/PYSEC-2026-3545","summary":"AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)","modified":"2026-08-04T14:30:13.745471923Z","packages":[{"ecosystem":"PyPI","name":"aiohttp","purl":"pkg:pypi/aiohttp","ranges":["<3.14.3"],"fixed":["3.14.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}